"OS X 10.9, which is internally codenamed 'Cabernet', will focus on various 'power-user' enhancements and take core features from iOS, according to our sources. Unlike operating system updates such as OS X Leopard and OS X Lion, OS X 10.9 will likely not be an overhauled approach to how the operating system feels and functions." Features for power users and features from iOS? Seems like an oxymoron. Still, if they manage to finally fix the Finder and Spaces, I'll be happy.

The two things I want from Mac OS are a newer version of OpenGL and a better filesystem. OpenGL 4 would be nice but even 3.3 would be a significant step forward.

For the filesystem I'd love it if Apple adopted the HAMMER filesystem from DragonflyBSD. It's an amazingly good filesystem and it has no patent issues like ZFS. Apple has always been happy to use BSD-licensed code in the past, HAMMER is more of the same.